vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-34557

MEDIUM
4.6
CVSS Score
Published: June 10, 2021 at 03:54 PM UTC
Updated: June 17, 2026 at 03:56 AM UTC
2 products affected across 2 vendorsFedoraXscreensaver

Using N/A by N/A?

Get instant alerts when new vulnerabilities affect N/A - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM4.6
Exploit prediction
EPSS 0.5%

Description

XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

References (7)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/06/11/1
Mailing Listx_refsource_MLISTExploitThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/07/06/2
x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/QubesOS/qubes-issues/issues/6595
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/
x_refsource_MISCExploitMailing ListThird Party Advisory
Source: [email protected]
https://www.openwall.com/lists/oss-security/2021/06/05/1

CVSS

4.6MEDIUM[email protected]
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-120

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card